I worked in a restaurant.
welcoming guests is not easy at all. You can stand all day, which is not much different from standing in the military posture.
cashier, busy, too, but there are seats available. But be careful and don't make mistakes, or you will lose money and take responsibility.
The waiter orders, serves and cleans up. He is always running when he is busy. He is very tired physically, but he is active. You can have a rest when you tidy up the room.
generally speaking, the cashier is better and has more rest.
that's all. I hope it will be adopted. thank you.